Urban centre (5,4)
I believe the answer is:
inner city
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">urban centre</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for inner city that I've seen before include "In run-down area" , "Urban sprawl" , "Urban centre" , "Centre of conurbation" .)